21546764 has 12 divisors (see below), whose sum is σ = 37749600. Its totient is φ = 10761168.

The previous prime is 21546751. The next prime is 21546781. The reversal of 21546764 is 46764512.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1757 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (3145800).

Almost surely, 2^21546764 is an apocalyptic number.

It is an amenable number.

21546764 is a deficient number, since it is larger than the sum of its proper divisors (16202836).

21546764 is a wasteful number, since it uses less digits than its factorization.

21546764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112 (or 6110 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 21546764 is about 4641.8492004803. The cubic root of 21546764 is about 278.2663458459.

The spelling of 21546764 in words is "twenty-one million, five hundred forty-six thousand, seven hundred sixty-four".